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![[Post New]](/templates/default/images/icon_minipost_new.gif) 27 Mar 2008 17:32:45 IST
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wherz ur soltn. ?
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its hard to manage cuZ everyday zz a challenge... n i am slipping .., can't loose up balance ..
i Try nOh to panic..! |
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27 Mar 2008 22:12:20 IST
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no.of ways of selecting 8 out of 20 = 20C8
now from one side no. of ways of selecting 4 from 10 such that no two are adjacent = 7C4
so probability = (7C4 * 7C4)/(20C8)
QED!!!!!!!!!!!!
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"Imagination is more important than knowledge."
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27 Mar 2008 22:14:32 IST
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priyesh @last 1 person got same as me!!
u wrote as 7C4 which is equal to 35
so v must b rite!
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by the left!!!
forward march!!!
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27 Mar 2008 22:19:21 IST
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yup we are absolutely rite i'm 100% sure coz selecting 4 out of 10 such that no two are adjacent is equiivalent to placing the four selected persons inbetween 6 non selected persons = 7C4 = 35  this is the shortest method & the most effective in exams just convert selection to placement.  |
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27 Mar 2008 22:51:23 IST
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i think recursions is shorter...@least the logic i use is :\
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by the left!!!
forward march!!!
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